Re: video - did she say "bow tails" instead of boat tails?
Also see Green Car Congress:
Quote:
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"Wal-Mart has set a goal of doubling the fuel efficiency of its new heavy-duty trucks by 2015. Some of the changes include trailer side skirts. Wind skirts under the trailer significantly reduce wind resistance and reduces airflow around the trailer. This is a big fuel economy benefit."
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source:
Green Car Congress: Wal-Mart Seeks to Double Truck Fuel Economy by 2015
